New method Filedb::duplicate()

 - Duplicate row by its `id`
 - Example: `Newsletter::duplicate(2)`
UPD Utilites::send_email() & Utilites::compose_error() & Utilites::html_form_build()

- Utilites::send_email() method new parms:
 - `@param array $from array(email, name)` - default: `array()` if
`$from` is not set `indira.email.no-reply` / `indira.name` config
values will be used as email / name
 - `@param bool $via_bcc` - default: false if `$via_bcc` set to `true`
recipients will be set to `bcc` field instead of `to`

- `Utilites::compose_error()` method new param:
 - `* @param  string  $lang_line_pattern` - default: `forms.%s_word`

- `Utilites::html_form_build()` new switch cases:
 - RENAMED `pretty_multiselect` instead of `tags` brings
functionality of multiselect to any fields